CN104792685A - Gas permeation test device and method for fractured coal rock - Google Patents
Gas permeation test device and method for fractured coal rock Download PDFInfo
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Abstract
The invention discloses a gas permeation test device and method for fractured coal rock and belongs to the field of seepage of coal rock. The invention provides a device for the gas permeation performance of the fractured coal rock, wherein the device is relatively excellent in air impermeability and precise in axial displacement parameter and confining pressure change can be known through the device. Moreover, through the device, research on the influences of air pressure at different temperatures and in different directions on the seepage property of the fractured coal rock can be realized. The problem in the prior art that the influence of a thermal field on gas permeation is unknown and the gas permeation property of the fractured coal rock under the multi-directional gas pressure difference is unknown is solved. Furthermore, the flow of the seepage field in each layer and the pressure difference change characteristic in a compaction process under the condition that multiple layers of coal rock with different lumpiness grains are combined are fully tested.
Description
Technical field
The present invention relates to a kind of fractured coal and rock gas infiltration experiment device and method, belong to coal and rock seepage flow field.
Background technology
Many fragmented rock body Gas Seepage Flows can be run in coal, natural gas extraction, as coal seam fragmentation exploitation coal-seam gas, adopt to bring out in Gas Outburst, goaf or broken coal petrography and implement gas drainage, nitrogen injection in goaf fire extinguishing, rock gas collection and accumulating etc.Only with regard to coal-mine gas (also known as coal-seam gas), coal is China's energy main body on the one hand, accounts for about 70% of primary energy formation, but has the mine of 44.4% to be high methane and Gas Outburst mine in state-owned coal mines.On the other hand, coal-seam gas is efficient clean energy resource and high-quality industrial chemicals.According to measuring and calculating, China's coal bed gas resource total amount is 25-35 tcm, occupies second place of the world.Develop coal-seam gas, enforcement national economy sustainable development strategy tool is of great significance.For administering coal-mine gas better, efficiently and economically developing coal-seam gas etc., very necessary to the analysis and research of fractured coal and rock gas infiltration.
The domestic and international research to permeability of rock at present mainly concentrates on the closely knit standard rock core test piece of quality, and the proving installation for the fractured coal and rock gas permeability often run in mining engineering is relatively blank.The research being in methane gas enrichment discipline in "O"-ring in goaf is related to the seepage flow Quality Research of fractured coal and rock under different temperatures, different axial compression and gas with various pressure differential.A kind of gas permeability tester for testing is disclosed through retrieval patent of invention ZL200820030674.6.But there is following shortcoming in its pervasion test device: (1) when temperature in coal-seam gas heat injection recovery process be a changing value, this device obviously can not study the impact of temperature on fractured coal and rock gas flow character; (2) when mining engineering runs into complex working condition, obvious gaseous tension is not only from a direction, and this device can not be studied fractured coal and rock seepage flow character under multi-direction gaseous tension; (3) because cylinder barrel only provides passive bound, therefore in compression process, confined pressure situation of change is completely unknown, and this has had a strong impact on the understanding to broken coal rock medium Penetration Signature; (4) gland contacts with cylinder barrel and can not realize good impermeability, and this has had a strong impact on the accuracy of gas permeability parameters; (5) gland axial displacement adopts the axial process of pressing machine, due to rampiston transmitting force (or displacement) to gland then gland passing to broken coal rock medium, the transmission looseness existed between this also constrains the measuring accuracy of axial displacement.
Summary of the invention
The present invention aims to provide that a kind of impermeability is better, axial displacement parameter accurate fractured coal and rock gas infiltration experiment device, and this device can realize different temperatures and different directions air pressure to the research of the impact of fractured coal and rock seepage flow character simultaneously.Present invention also offers fractured coal and rock gas permeability test method.
The invention provides a kind of fractured coal and rock gas infiltration experiment device, comprise cylinder barrel, above cylinder barrel, be provided with gland, be base below cylinder barrel, it is characterized in that:
Be provided with temperature controlled compartment outside described cylinder barrel, temperature controlled compartment is made up of cylinder, and cylinder bottom is connected with base by bolt,
Described gland is ladder-type structure, and gland center is provided with through hole, cuts somebody's hair to pass in this through hole, and below of cutting somebody's hair is connected with push pedal by screw thread, cuts somebody's hair and push pedal is provided with the gas outlet that communicate inner with cylinder barrel, is provided with displacement transducer above cutting somebody's hair; Inner wall of cylinder is evenly provided with pressure transducer, cylinder barrel barrel is evenly provided with pore, pore communicates with outside through cylinder barrel and temperature controlled compartment barrel, is provided with and vacuumizes hole in the middle part of cylinder barrel; Be provided with air intake opening bottom cylinder barrel, air intake opening communicates with outside through base; Be respectively equipped with air permeable plate bottom cylinder barrel He below push pedal, air permeable plate is provided with several holes;
Temperature controlled compartment top is provided with inlet opening, is provided with thermometer in the middle part of temperature controlled compartment, and bottom is provided with freeing port, and freeing port communicates with outside through base;
Institute's displacement sensors, pressure transducer connect wire, data collector, computer processor unit.
In said apparatus, between described cylinder barrel top and gland, be bolted between temperature controlled compartment cylinder and base, and junction is provided with O RunddichtringO; Describedly cut somebody's hair and between gland, be provided with O RunddichtringO.
In said apparatus, between bottom described air permeable plate and push pedal, cylinder barrel, be respectively equipped with gauze.
In said apparatus, the pressure transducer in described cylinder barrel is along the circumferential direction uniformly distributed four, and be arranged three layers in parallel along the inner upper, middle and lower of cylinder barrel, has 12 pressure transducers.
In said apparatus, pore in described cylinder barrel is along the circumferential direction uniformly distributed four, and be arranged in parallel two-layer along cylinder barrel is upper and lower, and every layer has two sidewall air admission holes and two sidewall ventholes, have eight pores, sidewall air admission hole and sidewall venthole distribute respectively axisymmetricly.
The invention provides a kind of fractured coal and rock gas permeability test method, adopt above-mentioned test unit, it is characterized in that: comprise the following steps:
(1), fractured coal and rock different-grain diameter sandstone sieve is divided into the broken body of different masses degree;
(2) by inlet opening, the apopore persistent loop inflow water of temperature controlled compartment;
(3), open gland, pour in cylinder barrel by the fractured coal and rock of having sieved, make its even natural packing, then close gland, tighten the screws realizes cylinder body seal;
(4), by vacuumizing hole, coal and rock in cylinder barrel is vacuumized;
(5), by air intake opening continue to inject methane in cylinder barrel, sample is adsorbed saturated;
(6), certain pressure methane gas is injected respectively by air intake opening and cylinder barrel sidewall air admission hole, record initial air intake opening, sidewall air admission hole and gas outlet, sidewall venthole flow and pressure, by microcomputer controlled electro-hydraulic servo pressing machine, test unit is pressurizeed, when displacement transducer display fractured coal and rock axial compression displacement is 2, 4, 6, 8, 10, 12, record respectively during 14mm into, gas outlet, sidewall correspondence is entered, the air pressure of venthole, flow and pressing machine axle pressure, inner wall of cylinder pressure transducer circumferential pressure value changes, off-test, take out test sample.
In said method, the granularity of described broken body is below 22.5mm, provides the mechanical fraction of different broken bodies, obtains the seepage flow character that pressing machine gives fractured coal and rock in different compression situation.
In said method, the temperature injecting water in described temperature controlled compartment is 0 ~ 100 DEG C; By the inlet opening of temperature controlled compartment, the water of apopore persistent loop inflow different temperatures, fractured coal and rock inlet, outlet, the corresponding air pressure into and out of pore of sidewall, flow and pressing machine axle pressure, inner wall of cylinder pressure transducer circumferential pressure value situation of change under axially different contractive condition under acquisition different temperatures.
In said method, the pressure injecting methane in described cylinder barrel is 10kPa ~ 1000kPa; Air intake opening and sidewall air intake opening adopt the gas of different pressures gradient, and under obtaining different directions pressure reduction, pressing machine gives the seepage flow character of fractured coal and rock in different compression situation.
In said method, described broken body is multilayer coal body, rock association body.
Under test unit provided by the invention and test method can obtain different temperatures (such as 20 DEG C, 40 DEG C, 60 DEG C, 80 DEG C, 100 DEG C), under different directions pressure reduction, under (air intake opening and sidewall air intake opening adopt the gas of different pressures gradient), different-grain diameter combined situation, (if 1.25 ~ 2.5mm, 2.5 ~ 5mm, 5 ~ 7.5mm three mass ratio are 1:2:3) pressing machine gives the seepage flow character of fractured coal and rock in different compression (compression 4mm, 6mm, 8mm, 10mm etc.) situation.
Beneficial effect of the present invention:
Compared with conventional apparatus: (1) this device and method overcomes traditional experiment device can not realize the research of thermal field to fractured coal and rock gas flow property effect; (2) the present invention successfully overcomes conventional apparatus and can not realize fractured coal and rock gas flow Quality Research under different directions gas differential pressure; (3) conventional apparatus fractured coal and rock circumferential pressure change under pressing machine loads is unknown, not enough to the understanding of broken body mechanical property under axial pressure side direction passive bound condition, present invention achieves the test of fractured coal and rock circumferential pressure change under pressing machine loads, obtain the mechanical property of broken body under axial pressure side direction passive bound condition; (4) conventional apparatus axial displacement directly adopts the axial process of pressing machine, in fact due to the looseness of each part fits, adopts this parameter to be not science, inaccurate as broken body axial compression degree; And the present invention adopt displacement transducer after the mode of data processing overcome the problems referred to above, this device feature coordinates impermeability to be also much better than conventional apparatus simultaneously; (5) conventional apparatus can not test the coal and rock combination of different lumpiness particle diameter (if upper strata is 25-20mm coal body, middle layer is the mud stone of 15-10mm particle diameter, lower floor is that 2.5-5mm particle diameter coal body three layers is deposited in one piece) every layer of seepage field flow, pressure differential variation characteristic in situation, multianalysis can not be carried out by stream field, this device is divided into two sections along sidewall, establish two into and out of pore for every section, totally 8 sidewalls are into and out of pore, can every layer of seepage field situation of change in the broken body compacting process of full test multilayer.
Accompanying drawing explanation
Fig. 1 is the structural representation of fractured coal and rock gas infiltration experiment device of the present invention,
In figure: 1, cut somebody's hair, 2, gas outlet, 3, O RunddichtringO, 4, push pedal, 5, gland, 6, cylinder barrel, 7, screw thread, 8-1, air admission hole, 8-2, venthole, 9, temperature controlled compartment, 10, air permeable plate, 11, air intake opening, 12, pressure transducer, 13, gauze, 14, bolt, 15, displacement transducer, 16, thermometer, 17, inlet opening, 18, apopore, 19 vacuumizes hole, 20, base.
Embodiment
Further illustrate the present invention below by embodiment, but be not limited to following examples.
Embodiment 1:
The present embodiment provides a kind of fractured coal and rock gas infiltration experiment device.
As shown in Figure 1, this device comprises cylinder barrel 6, is provided with gland 5 above cylinder barrel 6, is base 20 below cylinder barrel 6;
Be provided with temperature controlled compartment 9 outside described cylinder barrel 6, temperature controlled compartment 9 is made up of cylinder, and cylinder bottom is connected with base 20 by bolt,
Described gland 5 is ladder-type structure, and gland 5 center is provided with through hole, cuts somebody's hair 1 to pass in this through hole, cuts somebody's hair below 1 and is connected with push pedal 4 by screw thread 7, cut somebody's hair 1 and push pedal 4 be provided with the gas outlet 2 communicated with cylinder barrel inside, cut somebody's hair above 1 and be provided with displacement transducer 15; Cylinder barrel 6 inwall is evenly provided with pressure transducer 12, cylinder barrel 6 barrel is evenly provided with pore, pore comprises air admission hole 8-1 and venthole 8-2, and pore communicates with outside through cylinder barrel 6 and temperature controlled compartment 9 barrel, is provided with and vacuumizes hole 19 in the middle part of cylinder barrel 6; Be provided with air intake opening 11 bottom cylinder barrel 6, air intake opening 11 communicates with outside through base 20; Be respectively equipped with air permeable plate 10 bottom cylinder barrel 6 He below push pedal 4, air permeable plate 10 is provided with several holes;
Temperature controlled compartment 9 top is provided with inlet opening 17, is provided with thermometer 16 in the middle part of temperature controlled compartment 9, and bottom is provided with freeing port 18, and freeing port 18 communicates with outside through base 20;
Institute's displacement sensors 15, pressure transducer 12 connect wire, data collector, computer processor unit.
In said apparatus, between described cylinder barrel 6 top and gland 5, temperature controlled compartment 9 cylinder is connected by bolt 14 with between base 20, and junction is provided with O RunddichtringO 3; Described cutting somebody's hair between 1 and gland 5 is provided with O RunddichtringO 3.
In said apparatus, between bottom described air permeable plate 10 and push pedal 4, cylinder barrel 6, be respectively equipped with gauze 13.
In said apparatus, the pressure transducer 12 in described cylinder barrel 6 is along the circumferential direction uniformly distributed four, and be arranged three layers in parallel along the inner upper, middle and lower of cylinder barrel, has 12 pressure transducers.
In said apparatus, the pore in described cylinder barrel 6 is along the circumferential direction uniformly distributed four, and be arranged in parallel two-layer along cylinder barrel is upper and lower, has eight pores.Every layer has two sidewall air admission hole 8-1 and two sidewall venthole 8-2, and have eight pores, sidewall air admission hole and sidewall venthole distribute respectively axisymmetricly.
Embodiment 2:
Fractured coal and rock seepage flow character under research different temperatures.
The present embodiment is realized by following steps:
1), broken coal different-grain diameter sandstone sieve is divided into the broken coal of 2.5 ~ 5mm particle diameter;
2) water of 40 DEG C, is flowed into by inlet opening (17), apopore (18) persistent loop;
3), open gland (5), poured into by the broken coal of 2.5 ~ 5mm particle diameter in cylinder barrel (6), make its even natural packing, then close gland (5), tighten the screws (14) realizes cylinder body (6) sealing;
4), by vacuumizing hole (19), cylinder barrel (6) interior broken coal is vacuumized;
5), in cylinder barrel (6), continue the methane injecting 0.2MPa pressure, sample is adsorbed saturated;
6), 0.2MPa methane gas is injected by air admission hole (11), record initial air inlet/outlet (2) flow and pressure, by microcomputer controlled electro-hydraulic servo pressing machine Bit andits control, fractured coal and rock gas infiltration experiment device is pressurizeed, record respectively shaft position sensor displacement be 2,4,6,8mm time air inlet/outlet flow and force value change, off-test, takes out test sample;
7), by inlet opening (17), apopore (18) persistent loop flow into the water of 50 DEG C, repeat step 3) ~ 6);
8), by inlet opening (17), apopore (18) flow into the water of 60 DEG C, repeat step 3) ~ 6);
9), by inlet opening (17), apopore (18) flow into the water of 70 DEG C, repeat step 3) ~ 6).
Above-mentioned experiment is axially obtained broken body porosity by compression degree by broken body, the corresponding certain porosity of certain axial compression degree, simultaneously by broken body permeability under the certain compression degree of gain of parameter such as gas flow, atmospheric pressure value that records, so fractured coal and rock permeability and the porosity relation of 2.5 ~ 5mm particle diameter just can be obtained; By changing temperature controlled compartment temperature, under can recording certain compression degree, temperature field is to fractured coal and rock permeability affecting laws.
If change the particle diameter of subjects as can be obtained the relation in fractured coal and rock permeability-porosity and temperature field under different-grain diameter with 5 ~ 7.5mm or 7.5 ~ 10mm particle diameter.
Embodiment 3:
Study the seepage characteristic of fractured coal and rock under different draught head condition.
1), broken coal different-grain diameter sandstone sieve is sieved into the broken coal of 10 ~ 12.5mm particle diameter;
2), open gland (5), poured into by the broken coal of 10 ~ 12.5mm particle diameter in cylinder barrel (6), make its even natural packing, then close gland (5), tighten the screws (14) realizes cylinder body (6) sealing;
3), by vacuumizing hole (19), cylinder barrel (6) interior broken coal is vacuumized;
4), in cylinder barrel (6), continue the methane injecting 60kPa pressure, sample is adsorbed saturated;
5), by air admission hole (11) inject 60kPa methane gas, inject 10kpa methane from sidewall air admission hole (8-1) simultaneously, after steady air current, record initial air inlet/outlet (2), sidewall venthole (8-2) flow and pressure; Keep air intake opening (11) to inject 60kPa methane gas, inject 20kpa methane from sidewall air admission hole (8-1), after steady air current, record initial air inlet/outlet (2), sidewall venthole (8-2) flow and pressure changing; Keep air intake opening (11) to inject 60kPa methane gas, inject 30kpa methane from sidewall air admission hole (8-1), after steady air current, record initial air inlet/outlet (2), sidewall venthole (8-2) flow and pressure changing;
6), by microcomputer controlled electro-hydraulic servo pressing machine control to pressurize to fractured coal and rock gas infiltration experiment device, when displacement transducer shows broken coal axial compression 2mm, keep pressure constant, repeat step 5);
7), when displacement transducer shows broken body axial compression 4mm, keep pressure constant, repeat step 5);
8), when displacement transducer shows broken body axial compression 6mm, keep pressure constant, repeat step 5);
9), when displacement transducer shows broken body axial compression 8mm, keep pressure constant, repeat step 5);
10), off-test, take out test sample.
Above-mentioned experiment is axially obtained broken body porosity by compression degree by broken body, the corresponding certain porosity of certain axial compression degree, keep inlet pressure constant simultaneously, the seepage characteristic of fractured coal and rock under the different draught head condition of different directions is obtained by changing sidewall air admission hole air pressure, correlative study overcomes the limitation that conventional apparatus can only measure One-dimensional gas seepage characteristic, can test broken body seepage flow character under the different draught head condition of different porosities.
Embodiment 4:
Research multilayer coal petrography assembly piles up Penetration Signature in compacting process.
1), broken coal, mud stone, sandstone are sieved into respectively the fractured coal and rock of 22.5 ~ 20mm, 12.5 ~ 10mm, 5 ~ 2.5mm, tri-kinds of particle diameters with different-grain diameter sandstone sieve;
2) gland (5), is opened, the broken coal of 5 ~ 2.5mm sandstone, 12.5 ~ 10mm mud stone and 22.5 ~ 20mm particle diameter successively layering is poured in cylinder barrel (6), along Sidewall Height decile three sections, make every layer of even natural packing of different-grain diameter coal and rock, then close gland (5), tighten the screws (14) realizes cylinder body (6) sealing;
3), continued to inject 200kPa nitrogen to cylinder barrel by air intake opening, (now sidewall venthole connects precision pressure gauge, sidewall air admission hole seals) after steady air current, gather cylinder barrel gas outlet pressure, flow and every layer of (getting average for two) sidewall venthole pressure;
4), by microcomputer controlled electro-hydraulic servo pressing machine control to pressurize to fractured coal and rock gas infiltration experiment device, when displacement transducer shows axial compression 4mm, keep pressure constant, repeat step 3);
5), by microcomputer controlled electro-hydraulic servo pressing machine control to pressurize to fractured coal and rock gas infiltration experiment device, when displacement transducer shows axial compression 8mm, keep pressure constant, repeat step 3);
6), by microcomputer controlled electro-hydraulic servo pressing machine control to pressurize to fractured coal and rock gas infiltration experiment device, when displacement transducer shows axial compression 12mm, keep pressure constant, repeat step 3);
7), off-test, take out test sample.
Above-mentioned experiment is axially obtained broken body porosity by compression degree by broken body, the corresponding certain porosity of certain axial compression degree, simultaneously 4 sidewall ventholes (two every layer) as different-grain diameter coal petrography three layers of assembly under acquiring certain compression degree along stroke pressure test point along stroke pressure difference situation of change.Correlative study overcomes the shortcoming that conventional apparatus can only measure the broken body seepage characteristic of one deck, provides reference frame by for solving the research that there is seepage characteristic in multilayer coal petrography assembly layer compacting shattering process.
Claims (10)
1. a fractured coal and rock gas infiltration experiment device, comprises cylinder barrel, is provided with gland above cylinder barrel, is base, it is characterized in that below cylinder barrel:
Be provided with temperature controlled compartment outside described cylinder barrel, temperature controlled compartment is made up of cylinder, and cylinder bottom is connected with base by bolt,
Described gland is ladder-type structure, and gland center is provided with through hole, cuts somebody's hair to pass in this through hole, and below of cutting somebody's hair is connected with push pedal by screw thread, cuts somebody's hair and push pedal is provided with the gas outlet that communicate inner with cylinder barrel, is provided with displacement transducer above cutting somebody's hair; Inner wall of cylinder is evenly provided with pressure transducer, cylinder barrel barrel is evenly provided with pore, pore communicates with outside through cylinder barrel and temperature controlled compartment barrel, is provided with and vacuumizes hole in the middle part of cylinder barrel; Be provided with air intake opening bottom cylinder barrel, air intake opening communicates with outside through base; Be respectively equipped with air permeable plate bottom cylinder barrel He below push pedal, air permeable plate is provided with several holes;
Temperature controlled compartment top is provided with inlet opening, is provided with thermometer in the middle part of temperature controlled compartment, and bottom is provided with freeing port, and freeing port communicates with outside through base;
Institute's displacement sensors, pressure transducer connect wire, data collector, computer processor unit.
2. fractured coal and rock gas infiltration experiment device according to claim 1, is characterized in that: between described cylinder barrel top and gland, be bolted between temperature controlled compartment cylinder and base, and junction is provided with O RunddichtringO; Describedly cut somebody's hair and between gland, be provided with O RunddichtringO.
3. fractured coal and rock gas infiltration experiment device according to claim 1, is characterized in that: be respectively equipped with gauze between bottom described air permeable plate and push pedal, cylinder barrel.
4. fractured coal and rock gas infiltration experiment device according to claim 1, it is characterized in that: the pressure transducer in described cylinder barrel is along the circumferential direction uniformly distributed four, and be arranged three layers in parallel along the inner upper, middle and lower of cylinder barrel, have 12 pressure transducers.
5. fractured coal and rock gas infiltration experiment device according to claim 1, it is characterized in that: the pore in described cylinder barrel is along the circumferential direction uniformly distributed four, and along cylinder barrel upper and lower be arranged in parallel two-layer, every layer has two sidewall air admission holes and two sidewall ventholes, have eight pores, sidewall air admission hole and sidewall venthole distribute respectively axisymmetricly.
6. a fractured coal and rock gas permeability test method, adopts the device described in described any one of claim 1 ~ 5, it is characterized in that: comprise the following steps:
(1), fractured coal and rock different-grain diameter sandstone sieve is divided into the broken body of different masses degree;
(2) by inlet opening, the apopore persistent loop inflow water of temperature controlled compartment;
(3), open gland, pour in cylinder barrel by the fractured coal and rock of having sieved, make its even natural packing, then close gland, tighten the screws realizes cylinder body seal;
(4), by vacuumizing hole, coal and rock in cylinder barrel is vacuumized;
(5), by air intake opening continue to inject methane in cylinder barrel, sample is adsorbed saturated;
(6), certain pressure methane gas is injected respectively by air intake opening and cylinder barrel sidewall air admission hole, record initial air intake opening, sidewall air admission hole and gas outlet, sidewall venthole flow and pressure, by microcomputer controlled electro-hydraulic servo pressing machine, test unit is pressurizeed, when displacement transducer display fractured coal and rock axial compression displacement is 2, 4, 6, 8, 10, 12, record respectively during 14mm into, gas outlet, sidewall correspondence is entered, the air pressure of venthole, flow and pressing machine axle pressure, inner wall of cylinder pressure transducer circumferential pressure value changes, off-test, take out test sample.
7. fractured coal and rock gas permeability test method according to claim 6, it is characterized in that: the granularity of described broken body is below 22.5mm, the mechanical fraction of different broken bodies is provided, obtains the seepage flow character that pressing machine gives fractured coal and rock in different compression situation.
8. fractured coal and rock gas permeability test method according to claim 6, is characterized in that: the temperature injecting water in described temperature controlled compartment is 0 ~ 100 DEG C; By the inlet opening of temperature controlled compartment, the water of apopore persistent loop inflow different temperatures, fractured coal and rock inlet, outlet, the corresponding air pressure into and out of pore of sidewall, flow and pressing machine axle pressure, inner wall of cylinder pressure transducer circumferential pressure value situation of change under axially different contractive condition under acquisition different temperatures.
9. fractured coal and rock gas permeability test method according to claim 6, is characterized in that: the pressure injecting methane in described cylinder barrel is 10kPa ~ 1000kPa; Air intake opening and sidewall air intake opening adopt the gas of different pressures gradient, and under obtaining different directions pressure reduction, pressing machine gives the seepage flow character of fractured coal and rock in different compression situation.
10. fractured coal and rock gas permeability test method according to claim 6, is characterized in that: described broken body is multilayer coal body, rock association body.
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